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Calcimator

Fragrance Load Calculator

Calculate the exact amount of fragrance oil needed for your candle based on wax weight and desired fragrance percentage.

About this calculator

This calculator converts a target fragrance percentage into the actual weight of fragrance oil to add to a batch of wax, while checking that percentage against your wax type's maximum safe load. Fragrance Oil Needed is Wax Weight multiplied by whichever is smaller of Fragrance Percentage or Max Safe Load -- both Wax Weight and Fragrance Percentage move the fragrance amount by roughly the same proportion when Fragrance Percentage is below the max, but once you dial Fragrance Percentage up to and past Max Safe Load, the calculator caps the actual fragrance amount at the maximum and stops increasing it, flagging the excess separately as Over Max Load By. This saturation is deliberate: exceeding a wax's fragrance capacity causes "sweating" (oil beading on the surface), seepage, or reduced hot throw rather than a stronger scent, so the calculator refuses to keep scaling fragrance past the safe ceiling even though nothing stops you from entering a higher percentage.

Candles per 1 oz Bottle estimates how many batches a standard fragrance oil bottle will supply, assuming zero waste during measuring and pouring. What this does not account for: fragrance oils with different densities than the $10/oz assumed cost, flash point safety margins for the specific oil you're using, or the possibility that a particular fragrance blend's actual maximum safe load differs from the generic wax-type figure entered here.

Inputs

oz
%
%

Results

Fragrance Oil Needed

0.56 oz

Fragrance Oil15.9 g
Total Batch Weight7.56 oz
Over Max Load By0%
FO Cost (~$10/oz)$5.60
Candles per 1 oz Bottle1
How to Use This Calculator
  1. Enter wax weight in ounces and fragrance percentage you want to use.
  2. Set max safe load percentage (check your wax supplier's specification).
  3. Review Fragrance Oil Needed (oz and grams), Total Batch Weight, and whether you are Over Max Load.
  4. Never exceed the max fragrance load — oversaturation causes seeping, poor throw, or fire hazards.

How the result changes with Wax Weight

Wax WeightFragrance Oil Needed
3.50.28 oz
5.250.42 oz
110.88 oz
181.44 oz

What each input means

Wax Weight
Weight of melted wax in ounces. Use the candle wax calculator if you need to convert from container volume.
Fragrance Percentage
Desired fragrance load as a percentage of wax weight. 6-10% is the sweet spot for most waxes.
Max Safe Load
Maximum fragrance load your wax can hold. Soy ~10%, Paraffin ~12%, Coconut ~8%. Exceeding causes sweating/seepage.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Wax Weight = 7, Fragrance Percentage = 8, Max Safe Load = 10 = 3 input(s) provided
  2. Calculate Fragrance Oil Needed
    Fragrance Oil Needed
    0.56 = 0.56
  3. Calculate Fragrance Oil
    Fragrance Oil
    15.9 = 15.9
  4. Calculate Total Batch Weight
    Total Batch Weight
    7.56 = 7.56

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.

Frequently Asked Questions

What happens if I set Fragrance Percentage above Max Safe Load?

Fragrance Oil Needed stops increasing once Fragrance Percentage reaches Max Safe Load -- the calculator caps the actual fragrance amount at the safe ceiling rather than continuing to scale it up, and instead reports the excess separately in Over Max Load By so you can see exactly how far over spec your requested percentage was.

Why does exceeding the max fragrance load matter?

Wax can only hold so much fragrance oil before it starts "sweating" -- oil beading or pooling on the candle's surface -- or seeping out entirely, both of which waste product and can reduce how well the candle throws scent. Different waxes have different safe ceilings, which is why Max Safe Load is a separate adjustable input rather than a fixed constant.

Does changing Max Safe Load change how much fragrance oil I need?

Only if your Fragrance Percentage is already at or above the current Max Safe Load value -- in that case, raising the ceiling lets more fragrance through and Fragrance Oil Needed increases. If your Fragrance Percentage is already comfortably under the max, the max itself has no effect on the fragrance amount calculated.

How accurate is the Candles per 1 oz Bottle estimate?

It's a simple division of the fragrance oil amount into a 1 oz bottle, assuming no waste during measuring, mixing, or pouring -- real-world losses from residue left in mixing containers or measuring tools mean you'll typically get slightly fewer usable batches per bottle than this figure suggests.

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